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Cheap flights from Knoxville to Portugal from $327

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 4/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Knoxville to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:59 am - 8:10 am
TYS
-
LIS
20h 11m2 stops
United Airlines Logo
11:20 am - 8:52 pm
LIS
-
TYS
38h 32m2 stops
$491United Airlines
Fri, Jan 16 - Tue, Jan 20
KLM Logo
12:53 pm - 5:10 pm
TYS
-
FNC
23h 17m2 stops
KLM Logo
10:20 am - 11:52 pm
FNC
-
TYS
18h 32m2 stops
$508KLM
Thu, Feb 5 - Thu, Feb 12
United Airlines Logo
9:05 am - 8:10 am
TYS
-
LIS
18h 05m2 stops
United Airlines Logo
11:20 am - 2:49 pm
LIS
-
TYS
32h 29m2 stops
$590United Airlines
Wed, Jan 7 - Sat, Jan 17
KLM Logo
5:01 pm - 9:35 am
TYS
-
FNC
36h 34m2 stops
KLM Logo
10:25 am - 9:06 pm
FNC
-
TYS
38h 41m2 stops
$608KLM
Mon, Mar 16 - Mon, Mar 23
Multiple Airlines Logo
1:59 pm - 9:20 am
TYS
-
LIS
38h 21m2 stops
Multiple Airlines Logo
6:30 pm - 7:27 pm
LIS
-
TYS
53h 57m2 stops
$626Multiple Airlines
Sat, Jan 10 - Sat, Jan 17
British Airways Logo
7:55 am - 3:40 pm
TYS
-
LIS
26h 45m2 stops
British Airways Logo
6:45 pm - 7:26 pm
LIS
-
TYS
29h 41m2 stops
$700British Airways
Mon, May 4 - Mon, May 11
Multiple Airlines Logo
6:38 pm - 9:05 am
TYS
-
LIS
9h 27m1 stop
Multiple Airlines Logo
11:05 am - 8:39 pm
LIS
-
TYS
14h 34m1 stop
$713Multiple Airlines
Sun, Apr 5 - Fri, Apr 10
United Airlines Logo
7:00 am - 11:00 am
TYS
-
LIS
23h 00m2 stops
United Airlines Logo
11:25 am - 10:29 pm
LIS
-
TYS
40h 04m2 stops
$727United Airlines
Sun, Apr 5 - Sat, Apr 18
Multiple Airlines Logo
5:40 am - 9:05 am
TYS
-
LIS
22h 25m2 stops
Multiple Airlines Logo
11:05 am - 8:39 pm
LIS
-
TYS
14h 34m1 stop
$729Multiple Airlines
Sun, Apr 5 - Fri, Apr 10
British Airways Logo
6:10 am - 4:20 pm
TYS
-
LIS
29h 10m2 stops
British Airways Logo
11:05 am - 8:39 pm
LIS
-
TYS
14h 34m1 stop
$748British Airways
Sun, Apr 5 - Sat, Apr 18

United Airlines flights from Knoxville to Portugal

Our best United Airlines deals on Knoxville to Portugal flight tickets
United Airlines
Jan 16
TYS6:59 amKnoxville McGhee Tyson
20h 11m
2 stops
LIS8:10 amLisbon Humberto Delgado
Jan 20
LIS11:20 amLisbon Humberto Delgado
38h 32m
2 stops
TYS8:52 pmKnoxville McGhee Tyson
$491
Find similar
United Airlines
Jan 7
TYS9:05 amKnoxville McGhee Tyson
18h 05m
2 stops
LIS8:10 amLisbon Humberto Delgado
Jan 17
LIS11:20 amLisbon Humberto Delgado
32h 29m
2 stops
TYS2:49 pmKnoxville McGhee Tyson
$590
Find similar
United Airlines
Apr 5
TYS7:00 amKnoxville McGhee Tyson
23h 00m
2 stops
LIS11:00 amLisbon Humberto Delgado
Apr 18
LIS11:25 amLisbon Humberto Delgado
40h 04m
2 stops
TYS10:29 pmKnoxville McGhee Tyson
$727
Find similar

British Airways flights from Knoxville to Portugal

Our best British Airways deals on Knoxville to Portugal flight tickets
British Airways
May 4
TYS7:55 amKnoxville McGhee Tyson
26h 45m
2 stops
LIS3:40 pmLisbon Humberto Delgado
May 11
LIS6:45 pmLisbon Humberto Delgado
29h 41m
2 stops
TYS7:26 pmKnoxville McGhee Tyson
$700
Find similar
British Airways
Apr 5
TYS6:10 amKnoxville McGhee Tyson
29h 10m
2 stops
LIS4:20 pmLisbon Humberto Delgado
Apr 18
LIS11:05 amLisbon Humberto Delgado
14h 34m
1 stop
TYS8:39 pmKnoxville McGhee Tyson
$748
Find similar
British Airways
Jan 10
TYS7:44 amKnoxville McGhee Tyson
20h 21m
1 stop
LIS9:05 amLisbon Humberto Delgado
Jan 17
LIS10:40 amLisbon Humberto Delgado
15h 16m
1 stop
TYS8:56 pmKnoxville McGhee Tyson
$795
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 22, 2025.
Use the filters below to find and compare flights from Knoxville to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 1/16

6:59 am-8:10 am

2 stops20h 11m

Lisbon Humberto Delgado

Tue 1/20

11:20 am-8:52 pm

2 stops38h 32m

$491

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Thu 2/5

12:53 pm-5:10 pm

2 stops23h 17m

Funchal Madeira

Thu 2/12

10:20 am-11:52 pm

2 stops18h 32m

$508

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

9:05 am-8:10 am

2 stops18h 05m

Lisbon Humberto Delgado

Sat 1/17

11:20 am-2:49 pm

2 stops32h 29m

$590

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Mon 3/16

5:01 pm-9:35 am

2 stops36h 34m

Funchal Madeira

Mon 3/23

10:25 am-9:06 pm

2 stops38h 41m

$608

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 1/10

1:59 pm-9:20 am

2 stops38h 21m

Lisbon Humberto Delgado

Sat 1/17

6:30 pm-7:27 pm

2 stops53h 57m

$626

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 5/4

7:55 am-3:40 pm

2 stops26h 45m

Lisbon Humberto Delgado

Mon 5/11

6:45 pm-7:26 pm

2 stops29h 41m

$700

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

6:38 pm-9:05 am

1 stop9h 27m

Lisbon Humberto Delgado

Fri 4/10

11:05 am-8:39 pm

1 stop14h 34m

$713

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

7:00 am-11:00 am

2 stops23h 00m

Lisbon Humberto Delgado

Sat 4/18

11:25 am-10:29 pm

2 stops40h 04m

$727

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

5:40 am-9:05 am

2 stops22h 25m

Lisbon Humberto Delgado

Fri 4/10

11:05 am-8:39 pm

1 stop14h 34m

$729

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

6:10 am-4:20 pm

2 stops29h 10m

Lisbon Humberto Delgado

Sat 4/18

11:05 am-8:39 pm

1 stop14h 34m

$748

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Knoxville to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Knoxville is in January. Flight prices, which tend to average around $527, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Knoxville during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $638.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Monday is the cheapest day to fly to Portugal from Knoxville. The lowest ticket price found for a Monday departure recently was $819. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Saturday, with ticket prices averaging around $1,534.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is in the morning. Flights from Knoxville to Portugal during this time can be as low as $745. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,134 per ticket.

Can stopping save me money on Knoxville to Portugal flights?

You could potentially save up to 3% on your flight if you consider stops on a Knoxville to Portugal flight.

Cheap Knoxville to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Portugal

Fastest flight time

18h 05m

Direct flights

None
The fastest flight from Knoxville to Portugal takes 18h 05m
There are no direct flights from Knoxville to Portugal. There are no popular flight routes from Knoxville to Portugal.
Search flight deals

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Portugal?

    Prices for flights from Knoxville McGhee Tyson Airport to Portugal were last updated today.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Portugal?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Portugal?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents required for your trip to Portugal can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Portugal. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Knoxville to Portugal

Compare and see reviews for airlines that fly from Knoxville to Portugal with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $477Free CancellationRating
6.7
7,605 reviews
Search British Airways flights
American AirlinesPriceFrom $602Free CancellationRating
7.2
11,052 reviews
Search American Airlines flights
United AirlinesPriceFrom $633Free CancellationRating
7.4
9,102 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Portugal?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to Portugal. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Knoxville to Portugal with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Knoxville to Portugal flights to just show those with flexible booking policies.

How can momondo help me find flights from Knoxville to Portugal?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Portugal from Knoxville.

I’m not ready to book a flight from Knoxville to Portugal right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Portugal flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Find better results for your trip to Portugal

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Popular flights according to clicks in the last 7 days on momondo
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